But she has since appeared on TV and with other newspapers and she stands by what she wrote!
Sure, because she's clearly something of a delusional idiot. The essay is proof of that.
I didn't realize until reading the Guardian column you posted that the Daily Mail was notorious for changing writers' work in ways that made them look bad, which would of course be even more unconscionable.
But even if they published her essay exactly as written, even if Samantha Brick herself firmly believes every word of it, the problem remains that the Daily Mail editors, obviously seeing that the essay was ridiculous, published it anyway, giving it good play, knowing full well that they were hanging Samantha Brick out like raw meat to the internet wolves, not caring that she came off looking like a fool and capitalizing on yet another media-generated misogynist fake controversy pitting women against women.
Most responsible publications don't publish things purposely designed to make their writers look like fools.